As peaceandlovebro said, the brain is fully developed at the age of 25 for females and 30 for males, but for physical changes the start and end of puberty varies. I'd say puberty can start between the ages of 8-14 and end between the ages of 15-20. So I don't think there's a specific age when adolescence ends; you don't turn 18 and suddenly you're an adult, it's gradual and you can't pinpoint the day or even year it happens.
What age does adolescence end at?
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As peaceandlovebro said, the brain is fully developed at the age of 25 for females and 30 for males, but for physical changes the start and end of puberty varies. I'd say puberty can start between the ages of 8-14 and end between the ages of 15-20. So I don't think there's a specific age when adolescence ends; you don't turn 18 and suddenly you're an adult, it's gradual and you can't pinpoint the day or even year it happens.